GMC Black Stainless Steel Travel Tumbler Mug Keep your beverages hotter, colder, fresher, longer with maximum insulation from Thermos. Double-walled, vacuum-insulated travel tumbler has slide mechanism, spill-resistant lid with sliding lock. Disassembles for easy cleaning. Officially licensed by the automaker. Not intended for the microwave or dishwasher. Officially licensed by the automaker.